Double-roller extrusion granulator

Abstract

The utility model discloses a double-roller extrusion granulator, which relates to the technical field of granulation and comprises an extrusion chamber, a feed port and a discharge port, the feed port and the discharge port are respectively arranged at the top and the bottom of the extrusion chamber, and a pair of hollow extrusion rollers with the same structure are arranged in the extrusion chamber; the extrusion rollers are driven by two transmission shafts to rotate, the front ends of the extrusion rollers are fixed to the transmission shafts through front shaft sleeves, and the rear ends of the extrusion rollers are rotationally connected to the side wall of the extrusion chamber through rear shaft sleeves. According to the double-roller extrusion granulator, when the granulation granularity needs to be adjusted, the axial position of the adjusting shaft is adjusted, the extrusion rollers do not need to be disassembled, assembled and replaced, the granulation granularity adjusting efficiency and convenience are effectively improved, the disassembly and assembly frequency is greatly reduced, and the service life of the equipment is also prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of granulation, in particular to a double-roller extrusion granulator. Background Art

[0002] Extrusion granulator is a dry granulation equipment that uses pressure to agglomerate solid materials. The materials are squeezed by two counter-rotating extrusion rollers to form granules. It is widely used in chemical, pharmaceutical and other technical fields, and is also an important equipment in feed and fertilizer production.

[0003] However, different feeds or feed additives require different particle sizes. When dealing with different particle size requirements, existing double-roller extrusion granulators usually need to replace the extrusion rollers with suitable specifications. However, the disassembly of the extrusion rollers is troublesome, and multiple disassemblies can easily lead to deviations in the coordination between the structures, affecting the service life of the equipment.

[0004] Therefore, those skilled in the art are committed to developing a double-roll extrusion granulator that is convenient for adjusting the granulation particle size. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is that the existing double-roll extrusion granulator is not convenient for adjusting the granulation particle size.

[0006] To achieve the above-mentioned purpose, the utility model provides a double-roll extrusion granulator, comprising an extrusion chamber, and a feed port and a discharge port respectively arranged at the top and bottom of the extrusion chamber, wherein a pair of hollow extrusion rollers with the same structure are arranged in the extrusion chamber; the extrusion rollers are respectively driven to rotate by two transmission shafts, the front end of the extrusion rollers is fixed on the transmission shaft through a front sleeve, and the rear end is rotatably connected to the side wall of the extrusion chamber through a rear sleeve; a gear is fixed on the transmission shaft, and the two gears are meshed with each other to make the pair of extrusion rollers rotate synchronously relative to each other; a plurality of through holes corresponding to each other are uniformly opened in the radial direction on the two extrusion rollers, and an extrusion column is slidably arranged in the through hole, and a limit plate is fixed to the extrusion column on one side of the inner cavity of the extrusion roller, and a spring is connected between the limit plate and the inner wall of the extrusion roller;

[0007] The inner cavity of the extrusion roller is provided with an adjusting cylinder for adjusting the radial position of the extrusion column. The adjusting cylinder is conical and coaxial with the extrusion roller. The extrusion column rests on the conical surface of the adjusting cylinder under the action of the spring; the front end of the adjusting cylinder is slidably connected to the transmission shaft, and the rear end of the adjusting cylinder is fixedly connected with an adjusting shaft. The adjusting shaft sleeve is arranged in the rear shaft sleeve and passes through the outside of the extrusion chamber. The adjusting shaft and the rear shaft sleeve are connected in a manner that they can slide axially but cannot rotate relative to each other.

[0008] Furthermore, the adjusting shaft and the rear shaft sleeve are connected by a long key.

[0009] Furthermore, a hemispherical groove is formed at one end of the squeezing column away from the adjusting cylinder.

[0010] Furthermore, one end of the extrusion column that abuts against the adjustment cylinder is a ball head.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] When the granulation size of the double-roller extrusion granulator needs to be adjusted, the axial position of the adjustment shaft can be adjusted without disassembling and replacing the extrusion rollers, which effectively improves the efficiency and convenience of granulation size adjustment. The significant reduction in the number of disassembly and assembly times also increases the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a top view schematic diagram of the utility model;

[0015] Figure 3 is a longitudinal cross-sectional view of the squeezing roller;

[0016] Figure 4 It is a transverse cross-sectional view of the squeezing roller adjusted to a small particle size state;

[0017] Figure 5 It is a transverse cross-sectional view of the squeezing roller adjusted to a large particle size state.

[0018] Figure numerals: 1. extrusion chamber; 2. feed port; 3. discharge port; 4. extrusion roller; 5. transmission shaft; 6. gear; 7. through hole; 8. front bushing; 9. rear bushing; 10. adjustment cylinder; 11. adjustment shaft; 12. extrusion column; 13. limit ring; 14. spring. DETAILED DESCRIPTION

[0019] The following describes several preferred embodiments of the utility model with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The utility model can be embodied in many different forms of embodiments, and the protection scope of the utility model is not limited to the embodiments mentioned in the text.

[0020] In the drawings, components with the same structure are indicated by the same numerical labels, and components with similar structures or functions are indicated by similar numerical labels. The size and thickness of each component shown in the drawings are arbitrarily shown, and the utility model does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0021] refer to Figures 1 to 5 The utility model of the double-roll extrusion granulator comprises an extrusion chamber 1, and a feed port 2 and a discharge port 3 respectively arranged at the top and bottom of the extrusion chamber 1, a pair of hollow extrusion rollers 4 of the same structure are arranged in the extrusion chamber 1; the extrusion rollers 4 are driven to rotate by two transmission shafts 5 respectively, the front end of the extrusion roller 4 is fixed on the transmission shaft 5 through a front shaft sleeve 8, and the rear end is rotatably connected to the side wall of the extrusion chamber 1 through a rear shaft sleeve 9; a gear 6 is fixed on the transmission shaft 5, and the two gears 6 are meshed with each other to make the pair of extrusion rollers 4 rotate synchronously relative to each other; a plurality of through holes 7 corresponding to each other are uniformly opened in the radial direction on the two extrusion rollers 4, and an extrusion column 12 is slidably arranged in the through hole 7, and a limit plate 13 is fixed to the extrusion column 12 on one side of the inner cavity of the extrusion roller 4, and a spring 14 is connected between the limit plate 13 and the inner wall of the extrusion roller 4;

[0022] An adjusting cylinder 10 for adjusting the radial position of the extrusion column 12 is provided in the inner cavity of the extrusion roller 4. The adjusting cylinder 10 is conical and coaxial with the extrusion roller 4. The extrusion column 12 rests on the conical surface of the adjusting cylinder 10 under the action of the spring 14; the front end of the adjusting cylinder 10 is slidably connected to the transmission shaft 5, and the rear end of the adjusting cylinder 10 is fixedly connected to an adjusting shaft 11, which is sleeved in the rear shaft sleeve 9 and passes through the outside of the extrusion chamber 1, and the adjusting shaft 11 is connected to the rear shaft sleeve 9 in a manner that allows axial sliding but not relative rotation.

[0023] Furthermore, the adjusting shaft 11 and the rear shaft sleeve 9 are connected by a long key.

[0024] Furthermore, a hemispherical groove is formed at one end of the squeezing column 12 away from the adjusting cylinder 10. With this arrangement, the corresponding squeezing columns 12 on the two squeezing rollers 4 form a spherical granulation space when they are closed and squeezed; or when the squeezing columns 12 are adjusted to a position closer to the center of the squeezing roller 4, the granulation space is a prolate sphere.

[0025] Furthermore, one end of the squeezing column 12 that abuts against the adjusting cylinder 10 is a ball head.

[0026] Before use, adjust the axial position of the adjusting shaft 11 according to the required granulation particle size, that is, adjust the axial position of the adjusting cylinder 10; since the adjusting cylinder 10 is conical, after changing the position of the adjusting cylinder 10, since the squeezing column 12 abuts against the adjusting cylinder 10 under the action of the spring 14, the radial position of the squeezing column 12 in the through hole 7 will also change, so the granulation space between the corresponding two squeezing columns 12 is shortened or lengthened, and the granulation particle size is adjusted. The position locking between the adjusting shaft 11 and the rear sleeve 9 can be achieved by conventional locking methods, such as spring pins, radial locking screws, clamps, etc., which will not be repeated here.

[0027] During operation, the raw material is fed into the feed port 2 and falls to the upper position between the two squeezing rollers 4. The granular product is squeezed by the squeezing rollers 4 and falls from the discharge port 3. When the granulation size needs to be changed, the axial position of the adjustment shaft 11 can be adjusted again.

[0028] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technology in the field can make many modifications and changes according to the concept of the utility model without creative work. Therefore, any technical solution that can be obtained by a technician in the technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A double-roll extrusion granulator, characterized in that: The invention comprises an extrusion chamber (1), and a feed port (2) and a discharge port (3) respectively arranged at the top and the bottom of the extrusion chamber (1); a pair of hollow extrusion rollers (4) of the same structure are arranged in the extrusion chamber (1); the extrusion rollers (4) are respectively driven to rotate by two transmission shafts (5); the front end of the extrusion rollers (4) is fixed to the transmission shaft (5) by a front shaft sleeve (8), and the rear end is rotatably connected to the side wall of the extrusion chamber (1) by a rear shaft sleeve (9); the transmission shaft ( 5) is fixed with a gear (6), the two gears (6) are meshed with each other so that a pair of squeezing rollers (4) rotate synchronously relative to each other; a plurality of through holes (7) are evenly opened in the radial direction on the two squeezing rollers (4) and the positions thereof correspond to each other, a squeezing column (12) is slidably arranged in the through holes (7), a limiting plate (13) is fixed on the squeezing column (12) at one side of the inner cavity of the squeezing roller (4), and a spring (14) is connected between the limiting plate (13) and the inner wall of the squeezing roller (4); The inner cavity of the squeezing roller (4) is provided with an adjusting cylinder (10) for adjusting the radial position of the squeezing column (12); the adjusting cylinder (10) is conical and coaxial with the squeezing roller (4); the squeezing column (12) abuts against the conical surface of the adjusting cylinder (10) under the action of the spring (14); the front end of the adjusting cylinder (10) is slidably connected to the transmission shaft (5); the rear end of the adjusting cylinder (10) is fixedly connected to an adjusting shaft (11); the adjusting shaft (11) is sleeved in the rear shaft sleeve (9) and passes through to the outside of the squeezing chamber (1); the adjusting shaft (11) and the rear shaft sleeve (9) are connected in an axially slidable and non-rotatable manner.

2. The double-roll extrusion granulator according to claim 1, characterized in that: The adjusting shaft (11) and the rear shaft sleeve (9) are connected by a long key.

3. The double-roll extrusion granulator according to claim 1, characterized in that: A hemispherical groove is formed at one end of the squeezing column (12) away from the adjusting cylinder (10).

4. The double-roll extrusion granulator according to claim 1, characterized in that: One end of the squeezing column (12) that abuts against the adjusting cylinder (10) is a ball head.

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